Medical schools and universities are protesting Republicans’ decision to issue subpoenas for the names of researchers involved in fetal tissue studies, saying it could put their safety at risk. The Association of American Medical Colleges, which represents all of the country’s medical schools, expressed its “significant concerns” in a letter on Thursday to the heads of the congressional committee set up to investigate Planned Parenthood. “Initial requests sent to our member institutions failed to articulate why information that identified individuals was being requested and how the Panel intended to use this information,” the letter continues. “No assurances were provided to institutions that the Panel would institute any measures to ensure that this information would be safeguarded.” The letter urged committee leaders to establish bipartisan rules on how the information will be used and safeguarded. The Association of American Universities, and the Association of Public and Land-grant Universities joined the letter.